If a train operator with ME-23 brake valves wants to make a 15-pound brake pipe reduction, what should they do?

To achieve a 15-pound brake pipe reduction using ME-23 brake valves, holding the brake valve in the service position is the correct method. When the brake valve is held in the service position, it allows the operator to create a controlled reduction in air pressure within the brake pipe, which in this case, is specifically set to achieve a 15-pound reduction.

This gradual reduction is essential for ensuring smooth braking actions and maintaining train control during operations. The valve is designed to allow for variable reductions, enabling operators to adjust the braking effort to suit different situations. Simply holding the brake valve in service enables the system to respond appropriately to the operator's inputs, ensuring the desired brake application is met without causing abrupt changes that could affect the stability of the train.

In contrast, using emergency procedures, applying brakes manually, or fully releasing the brake valve each presents risks or problems. Emergency applications can lead to a sudden and harsh brake application, which is not what is needed for a specific poundage reduction. Manually applying the brakes can be unnecessary when a precise reduction is achievable through the valve. Releasing the brake valve completely would eliminate any braking force, counteracting the intent of reducing the brake pipe pressure to achieve a specific braking effect.